<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型</title>
    <style>
        div{
            /* width: 200px;
            height: 200px; */
            width: 0px;
            height: 0px;
            /* background: rgb(191, 26, 237); */
            /* padding: 10px;
            padding: 10px 20px;
            padding: 10px 20px 30px;
            padding: 10px 20px 30px 40px;
            padding-top: 10px;
            padding-right: 10px;
            padding-bottom: 10px;
            padding-left: 10px; */
            margin: 10px;
            margin: 10px 20px;
            margin: 10px 20px 30px;
            margin: 10px 20px 30px 40px;
            margin-top: 10px;
            margin-right: 10px;
            margin-bottom: 10px;
            margin-left: 10px;
            border: 10px solid rgb(240, 62, 118);
            border: 200px solid transparent;
            border-top: 200px solid #000;
            border-right: 200px double red;
            border-bottom: 200px dotted yellow;
            border-left: 200px dotted darkorange;
            border-radius: 50%;
            border-top-left-radius: 20%;
            border-top-right-radius: 30%;
            border-bottom-left-radius: 40%;
            border-bottom-right-radius: 50%;
            box-shadow: 10px 20px 10px 10px #22ee815a;
        }
        p{
            width: 1000px;
            height: 1000px;
            background: url(timg1.gif) center left no-repeat rgba(212, 119, 243, 0.13);
            background-size: 100%;
        }
        ul li{
            width: 200px;
            height: 200px;
            border: 1px solid yellowgreen;
            margin-top: 20px;
            margin-bottom: 40px;
        }
    </style>
</head>
<body>
    <div>
        盒子模型
    </div>
    <p>背景</p>
    <ul>
        <li></li>
        <li></li>
    </ul>
</body>
</html>